function  s1_hello(){
   echo "hello, world!"
}
function s2_tell_who_i_am(){
  echo "what's your  name?"
  read your_name
  echo "My name is $your_name"
}
function s3_which_distro_do_i_use(){
   NAME="Beta Linux"
   echo $NAME
}
function  s4_view_my_cpu_arch(){
  uname -m
}
function s5_show_first_scsi_disk_size(){
 lsblk -l | \grep disk | \grep '^sda ' | awk '{print int($4/1024/1024/1024)}'
}
function s6_show_main_memory_size_in_megabytes(){
  free -m |awk 'NR== 2 {print $2}'
}



